Litter box



FIG. 1 is a front elevation view of a litter box showing my novel design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof, of which the left side is a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a perspective view thereof; and,

FIG. 7 is an exploded perspective view of FIG. 6 including an environmental litter box canopy.

The broken lines on FIG. 7 are for illustrative purposes only and are not part of the claimed design. 

The ornamental design for a litter box, as shown and described. 